Description

Polaris Ranger / Sportsman 450 & 500 Prostar Crankshaft (2017–2022)

Restore the foundation of your engine with this Prostar replacement crankshaft for applicable Polaris Ranger and Sportsman 450 / 500 models. The crankshaft sits at the center of the rotating assembly and plays a major role in smooth operation, engine balance, and long-term durability.

If your engine has developed lower-end noise, excessive play, bearing damage, or suffered internal failure, replacing the crankshaft during the rebuild process helps protect the rest of the engine and supports reliable operation after assembly.

This Kit Includes

• Crankshaft

Fitment

• Polaris Ranger 500 Prostar
• Polaris Sportsman 450
• Polaris Sportsman 500
• Applicable 2017–2022 models

Why Replace the Crankshaft?

The crankshaft converts combustion force into usable power while maintaining balance throughout the engine. Over time, heat cycles, load, and normal wear can lead to vibration, reduced performance, or internal damage.

Replacing the crankshaft while the engine is apart helps support smoother operation and reduces the chance of rework later in the build process.

Build Out Your Engine Project

If your engine requires additional service, consider pairing this component with related rebuild parts and engine support items.

• Polaris Crankshaft Bearing Mapping Guide
• Engine Rebuild Kit Guide
• Warranty Policy

Support & Resources

Need help confirming fitment before teardown? Visit Contact REV6.

You can also browse the Help Center or review our FAQ.

For larger rebuild projects, explore our financing options.

Take Action

Order your Polaris Ranger / Sportsman 450 / 500 Prostar crankshaft and keep your rebuild moving with confidence using trusted components and REV6 support.

Thank you for choosing REV6 — your trusted source for high-performance powersports engines and parts. Proudly supporting U.S. veterans and servicemembers with special discounts.